Heidegger’s work grew out of the questions of phenomenology posed by his teacher Husserl, and developed into a quest for an understanding of Being. He argues that the separation of subject and object denies the more fundamental unity of being-in-the-world (Dasein). By drawing a distinction that I (the subject) am perceiving something else (the object), I have stepped back from the primacy of experience and understanding that operates without reflection. Heidegger rejects both the simple objective stance (the objective physical world is the primary reality) and the simple subjective stance (my thoughts and feelings are the primary reality), arguing instead that it is impossible for one to exist without the other. The interpreted and the interpreter do not exist independently: existence is interpretation, and interpretation is existence. Understanding Computers and Cognition p.31